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- Season 3 overviewOct 9, 2017-Jun 18, 201823 episodesSeason 3 episodes1. Girl of Steel Oct 9, 2017
- Kara deals with the loss of Mon-El by focusing on being Supergirl and concentrating on a new threat.
- 2. Triggers Oct 16, 2017
- A thief who has psychic powers attacks, immobilizing victims by tapping into their fears.
- 3. Far From the Tree Oct 23, 2017
- Maggie reaches out to her estranged father; Supergirl joins J'onn on a personal mission.
- 4. The Faithful Oct 30, 2017
- Kara investigates a new group that has a mysterious connection to Supergirl.
- 5. Damage Nov 6, 2017
- Morgan Edge blames Lena's lead bomb when children get sick; Kara tries to clear Lena's name.
- 6. Midvale Nov 13, 2017
- Kara and Alex head home to Midvale for a little rest; Kara recalls a painful childhood memory.
- 7. Wake Up Nov 20, 2017
- Kara investigates when an alien ship crash lands deep underwater beneath National City.
- 8. Crisis on Earth-X, Part 1 Nov 27, 2017
- When villains from Earth-X attack Barry and Iris' wedding, the superheroes fight to save the world.
- 9. Reign Dec 4, 2017
- Supergirl learns that a mysterious symbol popping up in the city is the mark of the World Killer.
- 10. Legion of Superheroes Jan 15, 2018
- Supergirl is in a dreamlike state while healing; Mon-El recruits a Legion member to help her.
- 11. Fort Rozz Jan 22, 2018
- Supergirl teams up with Saturn Girl, Livewire and Psi to find valuable information about Reign.
- 12. For Good Jan 29, 2018
- Kara steps in to help Lena when she is threatened by Morgan; Alex wants to run tests to help Sam.
- 13. Both Sides Now Feb 5, 2018
- When the DEO captures a Worldkiller, Supergirl and Alex use very different methods of interrogation.
- 14. Schott Through the Heart Apr 16, 2018
- When Winn's father dies, his estranged mother tries to reconnect and explain why she abandoned him.
- 15. In Search of Lost Time Apr 23, 2018
- Myr'nn causes psychic disturbances; Supergirl must work with J'onn to contain the chaos.
- 16. Of Two Minds Apr 30, 2018
- Supergirl and Imra have different ideas on how to stop the third Worldkiller, Pestilence.
- 17. Trinity May 7, 2018
- Supergirl asks Guardian for a favor; Supergirl braces for battle with all three Worldkillers.
- 18. Shelter From the Storm May 14, 2018
- When Reign starts hunting Ruby, Supergirl and Alex work together to keep her safe.
- 19. The Fanatical May 21, 2018
- A disciple of Coville's gives Kara and James a journal that could hold the key to saving Sam.
- 20. Dark Side of the Moon May 28, 2018
- Supergirl is stunned to learn that a part of Krypton survived; Alex is attacked while out with Ruby.
- 21. Not Kansas Jun 4, 2018
- Kara makes a major life decision; special DEO-caliber guns hit the streets of National City.
- 22. Make It Reign Jun 11, 2018
- Supergirl learns of Serena's nefarious plans for Earth; J'onn prepares to say goodbye to his father.
- 23. Battles Lost and Won Jun 18, 2018
- Supergirl and the team face off against Serena in an epic battle for Earth.